Denial of Service (DoS) Affecting cryptography package, versions [,1.0.2)
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Test your applications- Snyk ID SNYK-PYTHON-CRYPTOGRAPHY-40721
- published 4 Dec 2017
- disclosed 27 Sep 2015
- credit Emilia Käsper
How to fix?
Upgrade cryptography to version 1.0.2 or higher.
Overview
Affected versions of cryptography are vulnerable to Denial of Service (DoS).
The OpenSSL backend beffore 1.0.2 made use of assertions to check response where the tests could not trigger a failure. If a user ran Python with this -O flag and got an invalid response code this could lead to a crash.
Details
Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.
Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.
One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.
When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.
Two common types of DoS vulnerabilities:
High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.
Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm
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